Joseph foesythe



(No Model.) f

J. FORSYTHE.

ROTARY STEAM ENGINE.

` No. 335,122.- Pmelflted Peb. 2, 1886.

Wnesse'e. l I A Invii-dfn 1rv Nir FFICEt ROTARY STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 335,122, dated February 2, 1886.

Application tiled November 9, 1885. Serial No. 182,302. (No model.)

of, reference being had to the accompanying drawings, which form a part of this specification, wherein- Figure 1 is a View of a` vertical section through-median line transverse to axis. Fig. 2 is a viewr of a vertical section by median line parallel with axis. zontal section by median line.

My engine consists of a cylindrical shell, a, witha head, b, having a shaft, c, made fast in its center. The cap or other head, d, is provided at center with a proper stuffing-box, e, for shaft of piston. This cylinder a has in its concave surface midway between its heads five concentric segmental grooves, f, and five intervening transverse radial valve-recesses, g, each with small grooves in the adjacent cylinder-heads, to guide and hold a rectangular plate-Valve, i, with which it is provided, when the same is in motion or under pressure. Each of the concentric grooves has a passage-way, h, to valve-recess, the ports being in the back of the concentric groove at one end and in the back of the valve-recess behind valve.

The piston-body 7c is a solid cylinder of smaller diameter than the inside of the hollow cylinder, and is iixed on a stationary shaft, through which inlet and outlet passages reach and traverse the body and head of piston. rIhe piston-head1) is a segmental-shaped projection from the body of the piston long enough to cover any one of the concentric grooves, and reaching to the concave surface of the hollow cylinder, with inlet-port through its convex surface near one end, and opposite the concentric grooves in the concave surface of the cylinder, and outlet-port at the other end, an incline, s, on end near inlet-port, to ease down the valves i to the body of the piston `without shock, and at the other end, near Fig. 3 is a view of hori-` the outlet-port, an incline, u, to retire the valves. l

As to its mode of operation, this engine works as follows: The steam introduced by the inlet-way through the shaft of the piston traverses the body k and head of the piston p, venting from the port in the convex surface of the piston-head into any of the concentric groovesin the concave surface of the cylinder that may be opposite. A portion penetrating by the passage h to the valve-recess g behind the valve i drives it out into the valve-circle in front of the piston-head p, the incline s easing it down to the body of the piston k without shock; the residue of the steam, pouring into the valvecircle between the head p of the stationary piston and the valve z', held in the radial grooves in the heads of the rotary cylinder, forces the cylinder into revolution, Vwhich brings another ofthe concentric grooves f in front of inlet-port of piston-head, to receive the steam in the like manner and with the like effect as described, and so on ad infinitum. The revolution carrying the intervalvespaces succcssivel y over the outlet-way allows the steam to escape as well from the valve-recesses as from the.valvecircle, reliev- 75 ing the valves i, which are then borne against the incline u on the back of the head p, and by its resistance pressed back into their recesses.

I claim as my invention- In a rotary steam-engine, a stationary piston having one or more fixed heads, each head having inclines and influent and effluent ways, in combination with a rotating cylinder provided with three or more concent-ric segmental 85 slots or grooves in its concave surface, so arranged as to admit steam first into valve-reccsses to drive out valves, and then into valvecircle between fixed head and valves, also to transmit steam exhausting back from valve- 9o recess, substantially as described and shown.

In witness whereof I hereto sign my name.

JOSEPH FORSYTHE.

Witnesses:

O. P. ROBERTSON, SELwYN TAYLOR. 

